| // Copyright (c) 2016, the R8 project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| package com.android.tools.r8.ir.code; |
| |
| import com.android.tools.r8.cf.LoadStoreHelper; |
| import com.android.tools.r8.cf.TypeVerificationHelper; |
| import com.android.tools.r8.cf.code.CfArrayLoad; |
| import com.android.tools.r8.code.Aget; |
| import com.android.tools.r8.code.AgetBoolean; |
| import com.android.tools.r8.code.AgetByte; |
| import com.android.tools.r8.code.AgetChar; |
| import com.android.tools.r8.code.AgetObject; |
| import com.android.tools.r8.code.AgetShort; |
| import com.android.tools.r8.code.AgetWide; |
| import com.android.tools.r8.dex.Constants; |
| import com.android.tools.r8.errors.CompilationError; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.graph.DexItemFactory; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.graph.ProgramMethod; |
| import com.android.tools.r8.ir.analysis.type.ArrayTypeElement; |
| import com.android.tools.r8.ir.analysis.type.TypeElement; |
| import com.android.tools.r8.ir.conversion.CfBuilder; |
| import com.android.tools.r8.ir.conversion.DexBuilder; |
| import com.android.tools.r8.ir.conversion.TypeConstraintResolver; |
| import com.android.tools.r8.ir.optimize.Inliner.ConstraintWithTarget; |
| import com.android.tools.r8.ir.optimize.InliningConstraints; |
| import com.android.tools.r8.ir.regalloc.RegisterAllocator; |
| import java.util.Arrays; |
| import java.util.Set; |
| |
| public class ArrayGet extends ArrayAccess { |
| |
| private MemberType type; |
| |
| public ArrayGet(MemberType type, Value dest, Value array, Value index) { |
| super(dest, Arrays.asList(array, index)); |
| this.type = type; |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.ARRAY_GET; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| public Value dest() { |
| return outValue; |
| } |
| |
| @Override |
| public MemberType getMemberType() { |
| return type; |
| } |
| |
| @Override |
| public boolean couldIntroduceAnAlias(AppView<?> appView, Value root) { |
| assert root != null && root.getType().isReferenceType(); |
| assert outValue != null; |
| return outValue.getType().isReferenceType(); |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| int dest = builder.allocatedRegister(dest(), getNumber()); |
| int array = builder.allocatedRegister(array(), getNumber()); |
| int index = builder.allocatedRegister(index(), getNumber()); |
| com.android.tools.r8.code.Instruction instruction; |
| switch (type) { |
| case INT: |
| case FLOAT: |
| instruction = new Aget(dest, array, index); |
| break; |
| case LONG: |
| case DOUBLE: |
| assert builder.getOptions().canUseSameArrayAndResultRegisterInArrayGetWide() |
| || dest != array; |
| instruction = new AgetWide(dest, array, index); |
| break; |
| case OBJECT: |
| instruction = new AgetObject(dest, array, index); |
| break; |
| case BOOLEAN_OR_BYTE: |
| ArrayTypeElement arrayType = array().getType().asArrayType(); |
| if (arrayType != null && arrayType.getMemberType() == TypeElement.getBoolean()) { |
| instruction = new AgetBoolean(dest, array, index); |
| } else { |
| assert array().getType().isDefinitelyNull() |
| || arrayType.getMemberType() == TypeElement.getByte(); |
| instruction = new AgetByte(dest, array, index); |
| } |
| break; |
| case CHAR: |
| instruction = new AgetChar(dest, array, index); |
| break; |
| case SHORT: |
| instruction = new AgetShort(dest, array, index); |
| break; |
| case INT_OR_FLOAT: |
| case LONG_OR_DOUBLE: |
| throw new Unreachable("Unexpected imprecise type: " + type); |
| default: |
| throw new Unreachable("Unexpected type " + type); |
| } |
| builder.add(this, instruction); |
| } |
| |
| @Override |
| public boolean identicalAfterRegisterAllocation(Instruction other, RegisterAllocator allocator) { |
| // We cannot share ArrayGet instructions without knowledge of the type of the array input. |
| // If multiple primitive array types flow to the same ArrayGet instruction the art verifier |
| // gets confused. |
| return false; |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| return other.isArrayGet() && other.asArrayGet().type == type; |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| return Constants.U8BIT_MAX; |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| return Constants.U8BIT_MAX; |
| } |
| |
| @Override |
| public boolean instructionTypeCanThrow() { |
| // TODO: Determine if the array index out-of-bounds exception cannot happen. |
| return true; |
| } |
| |
| @Override |
| public boolean isArrayGet() { |
| return true; |
| } |
| |
| @Override |
| public ArrayGet asArrayGet() { |
| return this; |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, ProgramMethod context) { |
| return inliningConstraints.forArrayGet(); |
| } |
| |
| @Override |
| public boolean hasInvariantOutType() { |
| return false; |
| } |
| |
| @Override |
| public DexType computeVerificationType(AppView<?> appView, TypeVerificationHelper helper) { |
| // This method is not called for ArrayGet on primitive array. |
| assert this.outValue.getType().isReferenceType(); |
| DexType arrayType = helper.getDexType(array()); |
| if (arrayType == DexItemFactory.nullValueType) { |
| // JVM 8 ยง4.10.1.9.aaload: Array component type of null is null. |
| return arrayType; |
| } |
| return arrayType.toArrayElementType(appView.dexItemFactory()); |
| } |
| |
| @Override |
| public void insertLoadAndStores(InstructionListIterator it, LoadStoreHelper helper) { |
| helper.loadInValues(this, it); |
| helper.storeOutValue(this, it); |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| builder.add(new CfArrayLoad(type)); |
| } |
| |
| @Override |
| public TypeElement evaluate(AppView<?> appView) { |
| ArrayTypeElement arrayTypeLattice = |
| array().getType().isArrayType() ? array().getType().asArrayType() : null; |
| switch (getMemberType()) { |
| case OBJECT: |
| // If the out-type of the array is bottom (the input array must be definitely null), then |
| // the instruction cannot return. For now we return NULL as the type to ensure we have a |
| // type consistent witness for the out-value type. We could consider returning bottom in |
| // this case as the value is indeed empty, i.e., the instruction will always fail. |
| TypeElement valueType = |
| arrayTypeLattice == null |
| ? TypeElement.getNull() |
| : arrayTypeLattice.getMemberTypeAsValueType(); |
| assert valueType.isReferenceType(); |
| return valueType; |
| case BOOLEAN_OR_BYTE: |
| case CHAR: |
| case SHORT: |
| case INT: |
| assert arrayTypeLattice == null || arrayTypeLattice.getMemberTypeAsValueType().isInt(); |
| return TypeElement.getInt(); |
| case FLOAT: |
| assert arrayTypeLattice == null || arrayTypeLattice.getMemberTypeAsValueType().isFloat(); |
| return TypeElement.getFloat(); |
| case LONG: |
| assert arrayTypeLattice == null || arrayTypeLattice.getMemberTypeAsValueType().isLong(); |
| return TypeElement.getLong(); |
| case DOUBLE: |
| assert arrayTypeLattice == null || arrayTypeLattice.getMemberTypeAsValueType().isDouble(); |
| return TypeElement.getDouble(); |
| case INT_OR_FLOAT: |
| assert arrayTypeLattice == null |
| || arrayTypeLattice.getMemberTypeAsValueType().isSinglePrimitive(); |
| return checkConstraint(dest(), ValueTypeConstraint.INT_OR_FLOAT); |
| case LONG_OR_DOUBLE: |
| assert arrayTypeLattice == null |
| || arrayTypeLattice.getMemberTypeAsValueType().isWidePrimitive(); |
| return checkConstraint(dest(), ValueTypeConstraint.LONG_OR_DOUBLE); |
| default: |
| throw new Unreachable("Unexpected member type: " + getMemberType()); |
| } |
| } |
| |
| private static TypeElement checkConstraint(Value value, ValueTypeConstraint constraint) { |
| TypeElement latticeElement = value.constrainedType(constraint); |
| if (latticeElement != null) { |
| return latticeElement; |
| } |
| throw new CompilationError( |
| "Failure to constrain value: " + value + " by constraint: " + constraint); |
| } |
| |
| @Override |
| public boolean throwsNpeIfValueIsNull(Value value, AppView<?> appView, ProgramMethod context) { |
| return array() == value; |
| } |
| |
| @Override |
| public boolean throwsOnNullInput() { |
| return true; |
| } |
| |
| @Override |
| public Value getNonNullInput() { |
| return array(); |
| } |
| |
| @Override |
| public boolean outTypeKnownToBeBoolean(Set<Phi> seen) { |
| return array().getType().isArrayType() |
| && array().getType().asArrayType().getMemberType() == TypeElement.getBoolean(); |
| } |
| |
| @Override |
| public void constrainType(TypeConstraintResolver constraintResolver) { |
| constraintResolver.constrainArrayMemberType(type, dest(), array(), t -> type = t); |
| } |
| |
| @Override |
| public boolean instructionMayTriggerMethodInvocation(AppView<?> appView, ProgramMethod context) { |
| return false; |
| } |
| |
| @Override |
| public ArrayAccess withMemberType(MemberType newMemberType) { |
| return new ArrayGet(newMemberType, outValue(), array(), index()); |
| } |
| } |